JPWO2019159568A1 - Transmitter and transmission method - Google Patents

Abstract

A transmitter that can properly control the transmission power at the PT-RS port. In the transmitter (100), the control unit (101) determines the transmission power of the phase tracking reference signal (PT-RS) and the data signal within a range not exceeding the maximum transmission power for each antenna port. Then, the transmission unit (105) transmits the phase tracking reference signal and the data signal with the transmission power determined by the control unit (101).

Description

The present disclosure relates to transmitters and transmission methods.

A communication system called a 5th generation mobile communication system (5G) is being studied. In 5G, it is being considered to flexibly provide functions for each use case that requires an increase in communication traffic, an increase in the number of connected terminals, high reliability, and low latency. Typical use cases include Enhanced Mobile Broadband (eMBB), Massive Machine Type Communications (mMTC), Ultra Reliable and Low Latency Communications (URLLC). ). The 3GPP (3rd Generation Partnership Project), an international standardization organization, is considering the sophistication of communication systems from the perspectives of both the sophistication of LTE systems and New RAT (Radio Access Technology) (see, for example, Non-Patent Document 1). ing.

RP-161596, "Revision of SI: Study on New Radio Access Technology", NTT DOCOMO, September 2016 R1-1612335, "On phase noise effects", Ericsson, November 2016 3GPP TR 38.214 V15.0.0, "NR Physical layer procedure for data (Release 15)" (2017-12) R1-1611665, "Multi-panel based UL MIMO transmission", Huawei, HiSilicon, November 2016 3GPP TR 38.211 V15.0.0, "NR Physical channels and modulation (Release 15)" (2017-12)

In New RAT, for example, a signal having a frequency of 6 GHz or higher is used as a carrier wave. In particular, when using a high frequency band and a high-order modulation order, CPE (Common Phase Error) or ICI generated by the phase noise of the local oscillator (Local Oscillator). (Inter-carrier Interference) deteriorates the error rate characteristic (see, for example, Non-Patent Document 2). Therefore, in New RAT, in addition to channel equalization (Channel Equalization), the receiver uses CPE correction (CPE Correction) or ICI correction (ICI) using a phase tracking reference signal (PT-RS). Correction) (hereinafter sometimes referred to as "CPE / ICI correction") is being considered.

However, further study is required for transmission power control at the antenna port that transmits PT-RS (hereinafter, also referred to as "PT-RS port").

One aspect of the present disclosure contributes to the provision of a transmitter and a transmission method capable of appropriately controlling transmission power at the PT-RS port.

The transmitter according to one aspect of the present disclosure is determined by the control circuit for determining the transmission power of the phase tracking reference signal (PT-RS) and the data signal within a range not exceeding the maximum transmission power for each antenna port. It includes the PT-RS and a transmission circuit that transmits the data signal with the transmitted power.

In the transmission method according to one aspect of the present disclosure, the transmission power of the phase tracking reference signal (PT-RS) and the data signal is determined within a range not exceeding the maximum transmission power for each antenna port, and the determined transmission power is determined. Then, the PT-RS and the data signal are transmitted.

It should be noted that these comprehensive or specific embodiments may be realized in a system, device, method, integrated circuit, computer program, or recording medium, and the system, device, method, integrated circuit, computer program, and recording medium. It may be realized by any combination of.

According to one aspect of the present disclosure, transmission power control can be appropriately performed at the PT-RS port.

Further advantages and effects in one aspect of the present disclosure will be apparent from the specification and drawings. Such advantages and / or effects are provided by some embodiments and features described in the specification and drawings, respectively, but not all need to be provided in order to obtain one or more identical features. There is no.

The figure which shows the mapping example of DMRS and PT-RS in MIMO Diagram showing an example of power boosting Diagram showing an example of non-coherent transmission and coherent transmission The figure which shows the transmission example of PT-RS in the non-coherent transmission Block diagram showing a partial configuration of the transmitter according to the first embodiment Block diagram showing the configuration of the transmitter according to the first embodiment Block diagram showing the configuration of the receiver according to the first embodiment A flowchart showing the operation of the transmitter according to the first embodiment. The figure which shows an example of the transmission power adjustment which concerns on operation example 1 of Embodiment 1. The figure which shows an example of the transmission power adjustment which concerns on operation example 2 of Embodiment 1. The figure which shows an example of the transmission power adjustment which concerns on operation example 3 of Embodiment 1. The figure which shows an example of the transmission power adjustment which concerns on operation example 4 of Embodiment 1. The figure which shows an example of the transmission power adjustment which concerns on operation example 5 of Embodiment 1. Block diagram showing a configuration example of the transmitter according to the second embodiment Block diagram showing a configuration example of the receiver according to the second embodiment Block diagram showing a configuration example of the transmitter according to the third embodiment Block diagram showing a configuration example of the receiver according to the third embodiment

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[Power Boosting]
If the number of antenna ports (PT-RS ports) that transmit PT-RS and the number of antenna ports (DMRS ports) that transmit data and DMRS are different, RE (Resource Element) of PT-RS in one antenna port The transmission power per) may be set larger than the transmission power per RE of data in one antenna port transmitted / received between the same base station / mobile station. The transmission power control for this PT-RS may be called "power boosting". The power boosting of PT-RS improves the reception accuracy and CPE / ICI estimation accuracy of PT-RS, and can be expected to improve the transmission speed / transmission efficiency.

In addition, NR codebook based uplink supports full-coherent transmission, non-coherent transmission, and partial-coherent transmission. Is expected to occur. Of these, in non-coherent transmission and partial coherent transmission, there is an opinion that power boosting of PT-RS is difficult because the upper limit of transmission power (maximum transmission power) is set for each antenna port. However, for more accurate CPE / ICI estimation, the PT-RS should be power boosted as much as possible in any transmission method. Therefore, it is necessary to consider a method of power boosting the PT-RS even in non-coherent transmission or partial coherent transmission.

[PT-RS]
The higher the frequency band to which the signal is assigned, or the higher the number of modulation multi-values used in the signal, the greater the effect of CPE / ICI on the error rate characteristics. Therefore, as described above, when using a high frequency band / high-order modulation multi-value number, the receiver may perform CPE / ICI correction using PT-RS in addition to channel equalization. It is being considered.

PT-RS maps densely on the time axis compared to the reference signal (DMRS: Demodulation Reference Signal) for channel estimation (demodulation) in order to track CPE / ICI that fluctuates randomly over time. Will be done. Specifically, it is assumed that the PT-RS is mapped with a density of 1 symbol out of 2 adjacent symbols or 1 symbol out of 4 adjacent symbols for each symbol. In addition, PT-RS is mapped to a relatively low density in the frequency domain due to the characteristic that there is little variation between CPE / ICI subcarriers. Specifically, PT-RS is mapped with a density of one for each RB (Resource Block) (for example, one subcarrier), one for every two adjacent RBs, one for every four adjacent RBs, and so on. Is expected to occur.

According to the agreement on PT-RS in 3GPP RAN1 # 88, PT-RS is notified by the base station (BS, eNB, gNB) and higher layer signaling (for example, RRC (Radio Resource Control) signaling). Used with mobile stations (terminals, UEs). Further, it is assumed that the arrangement density of the PT-RS in the time domain and the frequency domain flexibly changes depending on the number of modulation multi-values used between the base station and the mobile station, the bandwidth, and the like.

In addition, a method for mobile stations to determine the placement density of PT-RS is being studied. One method is that the placement density of the PT-RS is notified from the base station by a control signal dedicated to the PT-RS (for example, DCI (Downlink Control Information) or RRC signal, etc.) (explicit notification). / explicit indication). As another method, the correspondence between the arrangement density of PT-RS and other parameters (for example, the number of modulation multi-values or the bandwidth) is determined, and the mobile station is notified by DCI at the time of communication. This is a method of determining the placement density of PT-RS by collating the parameters of PT-RS with their correspondence (implicit indication). In addition, a method other than these methods may be used.

On the other hand, DMRS used for channel estimation has a large change in the frequency domain of the channel characteristics, and the change in the time domain is not as large as the phase noise. It is mapped to a low density in the time domain. Furthermore, in New RAT, in order to accelerate the timing of data demodulation, it is envisioned that a front-loaded DMRS placed in front of the slot will be introduced.

Also, the PT-RS is located on the same antenna port as a DMRS (this port may be called the PT-RS port), and the same precoding as the DMRS port is applied to the PT-RS. Is being considered. Therefore, the receiver may use PT-RS for channel estimation as well as DMRS.

It is also possible that PT-RS is defined as part of DMRS. In this case, the DMRS used as the PT-RS is mapped to a higher density in the time domain and a lower density in the frequency domain than other DMRSs. In addition, the reference signal used to correct CPE / ICI generated by phase noise may be called by a different name from "PT-RS".

In addition, MIMO (Multiple Input Multiple Output) is expected to be used in New RAT. That is, the base station and one or more mobile stations in the cell configured by the base station can transmit and receive using a plurality of antenna ports corresponding to different precoding using the same time / frequency resource. ..

Base stations and mobile stations have limits on their maximum transmission power. Therefore, it is assumed that the total transmission power of the plurality of antenna ports used for data transmission is not exceeded by the maximum value of the transmission power. Further, basically, it is assumed that the transmission power of data between the antenna ports is equal. Therefore, for example, when transmitting data or a reference signal using one antenna port and when transmitting using n antenna ports, the transmission power per antenna port is higher in the former than in the latter. Is also considered to be n times larger.

The PT-RS is transmitted and received between the base station and each mobile station in the cell configured by the base station. Here, the CPE / ICI values are the same for a group of antenna ports (which may also be called a DMRS port group) that share the local oscillator of the transmitter (base station for downlink and mobile station for uplink). Probability is high. Therefore, it is assumed that PT-RS is transmitted from any one of the antenna ports in this group.

Further, it is considered that the PT-RS transmitted / received to one mobile station is orthogonally multiplexed in time / frequency / space with respect to the data. Therefore, when PT-RS is transmitted at a certain antenna port (a certain RE), nothing is transmitted at the RE at the other antenna port used by the mobile station. In other words, in one RE, one antenna port uses power for the PT-RS and the other antenna port does not use any power (nothing is transmitted).

In New RAT, the power of resources that are not used by such other antenna ports is used, and the transmission power per RE of one antenna port of PT-RS is datad by the power of this unused resource. Transmission power control for transmitting power larger than the transmission power per RE of one antenna port, that is, "PT-RS power boosting" is being studied.

As an example, FIG. 1 shows an example of mapping DMRS, PT-RS, and data in MIMO. In the RE (symbol x subcarrier) in the lowermost subcarrier of FIG. 1, PT-RS is transmitted at the antenna port 1000. At this time, in the same RE group (that is, the lowermost subcarrier) as the RE group to which PT-RS is transmitted at the antenna port 1000, nothing is transmitted at the antenna port 1001 (blank).

FIG. 2 shows an example of transmission power allocation in each RE of antenna ports 1000 and 1001 before and after power boosting the PT-RS. In the example shown in FIG. 2, the antenna port 1000 transmits the PT-RS by adding the power of the RE not used in the antenna port 1001 to the PT-RS (power boosting). Therefore, as shown in FIG. 2, after the power boosting of the PT-RS, not only the RE to which the PT-RS is transmitted but also the transmission power of the entire antenna port 1000 is higher than the transmission power of the antenna port 1001. growing.

Here, according to the description regarding the power boosting of the uplink PT-RS in Non-Patent Document 3, when the PT-RS is transmitted in one antenna port (one PT-RS port) in the uplink, the PT- The ratio representing "how many times the power of data is the power of PT-RS" for each RE in the RS port is ρ _{PTRS, i,} and it is calculated by the following equation.

In equation (1), n _layer ^PUSCH indicates the number of layers of transmission data set in the base station (that is, the receiver).

[Precoding of transmitter]
In the uplink transmission of New RAT, two transmission methods, codebook based UL transmission and non-codebook based UL transmission, are assumed (for example, non-patent documents). See 3). Moreover, in codebook-based transmission, the number of precoding matrices that can be used depends on the type of coherent transmission that the mobile station can support. It is assumed that the types of mobile station capabilities (UE capability) for coherent transmission can be divided into the following three types.
fullAndPartialAndNonCoherent
partialAndNonCoherent
Non-Coherent

The first "fullAndPartialAndNonCoherent" indicates that it has the capacity to support all types of coherent transmissions. The second "partialAndNonCoherent" indicates that it has the capacity to support partial and non-coherent transmissions. The third "Non-Coherent" indicates that it has the capability to support only non-coherent transmission.

Here, "non-coherent transmission" is a transmission method in which independent precoding is applied to different antenna panels in a transmitter in which a plurality of non-uniform antenna panels are mounted (for example, non-patent documents). 4). In this case, the data on different layers are transmitted from different panels. "Coherent transmission" is a transmission method in which data on all layers can be transmitted from all antenna panels in a transmitter on which a uniform antenna panel is mounted. Further, "partially coherent transmission" is a transmission method in which data of a part of layers is transmitted from a part of antenna panels and data of another layer is transmitted from the remaining antenna panels.

Table 1 shows a precoding matrix that is assumed to be usable when the number of layers is 2 and the number of antenna ports is 2 (see, for example, Non-Patent Document 5). It is assumed that in coherent transmission, all the matrices in Table 1 can be used, while in non-coherent transmission, only the leftmost matrix in Table 1 can be used.

FIG. 3 shows a transmission example of non-coherent transmission and coherent transmission. As shown in FIG. 3, in the case of non-coherent transmission, the data of each layer (Layer # 1 and # 2) is transmitted from independent panels by the precoding matrix.

FIG. 4 shows a transmission example when PT-RS is transmitted in non-coherent transmission. As described above, the PT-RS may be transmitted on some antenna ports (Port # 1 in FIG. 4). Therefore, in the case of non-coherent transmission (or partial coherent transmission), the transmission power of the panel that transmits PT-RS (the panel corresponding to Port # 1 in FIG. 4) becomes the other panel (Port # 2 in FIG. 4). It can be greater than the transmit power of the corresponding panel). Further, when the PT-RS shown in FIG. 4 is power boosted, the transmission power of the panel may exceed the power that can be transmitted as a performance. As a result, the signal including the PT-RS may be distorted, or the PT-RS may not be transmitted with the intended power, resulting in deterioration of the CPE / ICI estimation accuracy, which may deteriorate the data transmission efficiency. There is.

Therefore, in one aspect of the present disclosure, in non-coherent transmission or partial coherent transmission, transmission power control (including power boosting) is appropriately performed for PT-RS to improve CPE / ICI estimation accuracy, and data. The method of improving the transmission efficiency of the above will be described.

[Signal waveform]
In New RAT, it is assumed that the CP-OFDM (Cyclic Prefix --Orthogonal Frequency Division Multiplexing) method will be used for the downlink (direction from the base station to the mobile station, downlink). On the other hand, both CP-OFDM method and DFT-S-OFDM (Discrete Fourier Transform-Spread OFDM) method are being studied for uplink (direction from mobile station to base station, uplink), and communication is performed according to the communication environment. It is expected to be used by switching the method.

[PHR]
In New RAT, it is assumed that transmission power reserve information (PHR: Power Headroom Report) similar to LTE is transmitted in uplink transmission. That is, the mobile station, which is a transmitter, reports the value obtained by subtracting the actual data transmission power from the maximum transmission power of the mobile station to the base station as PHR. However, the PHR value is not the surplus power of the transmission power for each antenna port, but the value of the mobile station as a whole, which is a collection of all the antenna ports.

(Embodiment 1)
[Outline of communication system]
The communication system according to the present embodiment includes a transmitter 100 and a receiver 200. That is, on the uplink, the transmitter is a mobile station and the receiver is a base station. In the downlink, the transmitter is a base station and the receiver is a mobile station.

FIG. 5 is a block diagram showing a partial configuration of the transmitter 100 according to the present embodiment. In the transmitter 100 shown in FIG. 5, the control unit 101 determines the transmission power of the phase tracking reference signal (PT-RS) and the data signal within a range not exceeding the maximum transmission power for each antenna port, and the transmission unit 105. Transmits the PT-RS and data signals with the determined transmit power.

[Transmitter configuration]
FIG. 6 is a block diagram showing the configuration of the transmitter 100 according to the present embodiment. In FIG. 6, the transmitter 100 includes a control unit 101, an error correction coding unit 102, a modulation unit 103, a signal allocation unit 104, a transmission unit 105, and an antenna 106.

Information such as the transmission power remaining capacity of the transmitter 100 is input to the control unit 101. The control unit 101 determines the transmission power of data, PT-RS, or the like based on this information or the like. Then, the control unit 101 outputs the transmission power information indicating the determined transmission power to the signal allocation unit 104.

The error correction coding unit 102 error-corrects and encodes the input transmission data signal, and outputs the data signal after the error correction coding to the modulation unit 103.

The modulation unit 103 performs modulation processing on the signal input from the error correction coding unit 102, and outputs the modulated data signal to the signal allocation unit 104.

The signal allocation unit 104 maps the data signal input from the DMRS, PT-RS, or the modulation unit 103 to the time / frequency domain, and outputs the mapped signal to the transmission unit 105. At this time, the signal allocation unit 104 sets the transmission power of each signal based on the transmission power information input from the control unit 101.

The transmission unit 105 performs wireless transmission processing such as frequency conversion using a carrier wave on the signal input from the signal allocation unit 104, and outputs the signal after the wireless transmission processing to the antenna 106.

The antenna 106 radiates a signal input from the transmitting unit 105 toward the receiver 200.

[Receiver configuration]
FIG. 7 is a block diagram showing a configuration example of the receiver 200 according to the present embodiment. In FIG. 7, the receiver 200 includes an antenna 201, a receiver 202, a signal separation unit 203, a channel estimation unit 204, a CPE / ICI estimation unit 205, a data demodulation unit 206, and an error correction / decoding unit 207. Has.

The antenna 201 receives the signal transmitted from the transmitter 100 (see FIG. 6) and outputs the received signal to the receiving unit 202.

The receiving unit 202 performs wireless reception processing such as frequency conversion on the received signal input from the antenna 201, and outputs the signal after the wireless reception processing to the signal separation unit 203.

The signal separation unit 203 identifies and separates the positions of the time / frequency regions to which the data signal, DMRS, and PT-RS are mapped in the signal input from the reception unit 202. Of the separated signals, the signal separation unit 203 outputs the data signal to the data demodulation unit 206, outputs the DMRS to the channel estimation unit 204 and the CPE / ICI estimation unit 205, and outputs the PT-RS to the channel estimation unit 204 and the CPE. / Output to ICI estimation unit 205.

The channel estimation unit 204 estimates the channel using the DMRS input from the signal separation unit 203, and outputs the channel estimation value (channel information) to the data demodulation unit 206. The channel estimation unit 204 may estimate the channel using the PT-RS input from the signal separation unit 203. In this case, the channel estimation unit 204 uses the information regarding the amplitude of the input PT-RS (for example, the amplitude (power) ratio of the PT-RS transmitted from the transmitter 100 and the data signal) to the PT-RS. Channel estimation may be performed based on.

The CPE / ICI estimation unit 205 estimates the CPE / ICI using the PT-RS and DMRS input from the signal separation unit 203, and outputs the CPE / ICI estimated value to the data demodulation unit 206.

The data demodulation unit 206 demodulates the data signal input from the signal separation unit 203 using the channel estimated value input from the channel estimation unit 204 and the CPE / ICI estimated value input from the CPE / ICI estimation unit 205. .. The data demodulation unit 206 outputs the demodulated signal to the error correction decoding unit 207.

The error correction decoding unit 207 decodes the demodulated signal input from the data demodulation unit 206, and outputs the obtained received data signal.

[Operation of transmitter 100 and receiver 200]
Next, the operations of the transmitter 100 and the receiver 200 will be described in detail.

FIG. 8 is a flowchart showing a processing flow of the transmitter 100.

The transmitter 100 performs, for example, non-coherent transmission or partial coherent transmission.

First, the transmitter 100 (control unit 101) sets the transmission power of the PT-RS and the data signal (DMRS) (ST101). At this time, the transmitter 100 may set a predetermined transmission power for the data signal and apply power boosting to the PT-RS.

Next, the transmitter 100 (control unit 101) determines whether or not the set transmission power needs to be adjusted (ST102). For example, the transmitter 100 has insufficient spare power to transmit signals (PT-RS and data signals) with the transmission power set in ST101 at the antenna port (PT-RS port) to which PT-RS is transmitted. If so, it is determined that the transmission power needs to be adjusted.

When the transmission power adjustment is not necessary (ST102: NO), the transmitter 100 proceeds to the process of ST104.

On the other hand, when the transmission power needs to be adjusted (ST102: YES), the transmitter 100 (control unit 101) sets the transmission power within the maximum transmission power for each antenna port (that is, below the maximum transmission power). Is adjusted (ST103). That is, when the remaining power for transmitting a signal with the set transmission power is insufficient, the transmitter 100 reduces the transmission power so as to be within the maximum transmission power for each antenna port.

Then, the transmitter 100 (transmitter 105) transmits a signal from each antenna port with the transmission power set in ST101 or the transmission power adjusted in ST103 (ST104).

Next, operation examples 1 to 5 of the transmission power adjustment (ST103 in FIG. 8) by the transmitter 100 when the spare power for transmitting the signal with the set transmission power is insufficient will be described in detail.

In the following, as an example, a case where data (DMRS) and PT-RS are assigned to the antenna port 1000 and data (DMRS) is assigned to the antenna port 1001 will be described. In addition, the transmitter 100 uses, for example, a high frequency band and a high-order modulation multi-value number, and applies power boosting to the PT-RS in non-coherent transmission or partial coherent transmission.

Further, the left side of FIGS. 9 to 13 shows the data at each antenna port 1000, 1001 before reducing the transmission power (before adjustment) and the transmission power for each RE set for the PT-RS, and FIGS. 9 to 9 to 13. The right side of FIG. 13 shows the data at each antenna port 1000 and 1001 after reducing the transmission power (adjusted) and the transmission power for each RE of PT-RS.

<Operation example 1>
First, the transmitter 100 sets the ratio representing "how many times the power of data is the power of PT-RS" for each RE at the i-th PT-RS port as ρ _{PTRS, i,} and obtains it by the following equation. ..

Here, N _PTRS indicates the number of PT-RS ports (the # of PT-RS ports configured with the TX) set in the transmitter 100. In addition, n _DMRS ^{PTRS, i} indicates the number of DMRS ports belonging to the DMRS port group associated with the i-th PT-RS port (the # of DMRS ports associated with PT-RS port i). For example, in the example shown in FIG. 9, N _PTRS = 1 and n _DMRS ^{PTRS, i} = 2.

The transmitter 100 may calculate the _{ratios ρ PTRS, i} by using the equation (1) instead of the equation (2).

Next, the transmitter 100 reduces (adjusts) the signal transmission power so as to be within the maximum transmission power for each antenna port.

FIG. 9 shows an example of transmission power adjustment in the operation example 1.

As shown in FIG. 9, the transmitter 100 transmits PT-RS and data at all antenna ports 1000,1001 while maintaining _{the power ratio ρ PTRS, i between data and PT-RS before and after adjustment.} Reduce signal transmission power. That is, the transmitter 100 reduces the PT-RS and the data signal of the antenna port 1000 which is the PT-RS port, and also reduces the transmission power of the data signal of the other antenna port 1001.

As a result, the data transmission power is constant (same) between the antenna ports even after the transmission power is adjusted, so that the transmitter 100 can fairly transmit the data on all the antenna ports.

Further, since the ratio of the transmission power between the data and the PT-RS does not change before and after the adjustment of the transmission power, it does not affect the reception processing using the ratio.

Further, when the receiver 200 obtains the information that "the remaining power for transmitting with the set transmission power at the PT-RS port of the transmitter 100 is insufficient", the PT-RS is obtained from this information. The amplitude (power) ratio between the data and the data may be estimated, and channel estimation may be performed using PT-RS based on the estimated ratio.

<Operation example 2>
FIG. 10 shows an example of transmission power adjustment in operation example 2.

As shown in FIG. 10, the transmitter 100 transmits the PT-RS and the PT-RS port (antenna port 1000) while maintaining _{the power ratio ρ PTRS, i between the data and the PT-RS before and after the adjustment.} Reduce the transmission power of data signals. That is, the transmitter 100 reduces the transmission power at the PT-RS port, whereas the transmitter 100 does not reduce the transmission power at the antenna port 1001 other than the PT-RS port.

As a result, in the PT-RS port, the ratio of the transmission power between the data and the PT-RS does not change before and after the adjustment of the transmission power, so that the reception processing using the ratio is not affected.

Further, since the data transmission power is not reduced at the antenna port other than the PT-RS port, it is possible to prevent the receiver 200 from deteriorating the data reception accuracy.

<Operation example 3>
FIG. 11 shows an example of transmission power adjustment in the operation example 3.

As shown in FIG. 11, the transmitter 100 reduces the data transmission power at the PT-RS port (antenna port 1000) while maintaining the PT-RS transmission power without reducing it. That is, in the operation example 3, the transmitter 100 does not maintain _{the power ratio ρ PTRS, i between the data and the PT-RS before the adjustment.}

As a result, since the transmission power of the PT-RS does not decrease in the PT-RS port, it is possible to prevent deterioration of the reception accuracy of the PT-RS in the receiver 200.

<Operation example 4>
FIG. 12 shows an example of transmission power adjustment in the operation example 4.

As shown in FIG. 12, the transmitter 100 reduces the transmission power by transmitting nothing in some of the REs to which data is mapped in the PT-RS port (antenna port 1000). .. That is, in the operation example 4, the transmitter 100 reduces the transmission power in some REs to which the data signal is mapped at the PT-RS port, and transmits the PT-RS and the data signal mapped to the other REs. Maintain power without reducing it.

As a result, in the PT-RS port, the transmission power of the PT-RS and the data in the RE actually transmitted from the transmitter 100 does not decrease, so that the deterioration of the reception accuracy of the PT-RS and the data in the receiver 200 can be prevented. Can be done.

<Operation example 5>
FIG. 13 shows an example of transmission power adjustment in the operation example 5.

As shown in FIG. 13, the transmitter 100 reduces the transmission power of the PT-RS to the transmission power of the data signal at the PT-RS port (antenna port 1000). That is, the transmitter 100 reduces the transmission power of the PT-RS at the PT-RS port, and does not reduce the transmission power of the data signal.

That is, as shown in FIG. 13, in the transmitter 100, the power ratio between the data and the PT-RS is ρ _{PTRS, i} = 1, and the PT-RS is the same “power per antenna port and per RE” as the data. Send with. In other words, the transmitter 100 cancels the power boosting of the PT-RS.

As a result, the transmission power of the data signal is not reduced, so that deterioration of the data reception accuracy of the receiver 200 can be prevented.

Although FIG. 13 has described the case where the transmission power of the PT-RS is reduced to the transmission power of the data signal, the present invention is not limited to this, and the transmitter 100 does not exceed the maximum transmission power of the PT-RS port. In addition, the transmission power of the PT-RS may be reduced. That is, the adjusted transmission power of the PT-RS may be larger or smaller than the transmission power of the data signal.

The operation examples 1 to 5 have been described above.

As described above, in the present embodiment, the transmitter 100 transmits the data signal with the specified transmission power in the case of non-coherent transmission or partial coherent transmission, and power boosts and transmits the PT-RS. At this time, if the PT-RS port has insufficient spare power for transmitting with the set transmission power, the transmitter 100 adjusts the transmission power so as to be within the maximum transmission power for each antenna port.

That is, the transmitter 100 sets the transmission power of the PT-RS and the signal (data, etc.) transmitted at the same time as the PT-RS within a range not exceeding the maximum transmission power of each antenna port. This transmission power setting may include the application and deactivation of PT-RS power boosting. Further, when the transmission power set in the PT-RS port exceeds the maximum transmission power of the PT-RS port, the transmitter 100 adjusts the transmission power to be equal to or less than the maximum transmission power of each antenna port.

As a result, even in transmission in which the power cannot be adjusted between the antenna ports, such as non-coherent transmission or partial coherent transmission, the transmitter 100 has a maximum of each antenna port according to the remaining power of the transmitter 100. The PT-RS can be transmitted with the strongest possible power within the range that does not exceed the transmission power. As a result, the receiver 200 can improve the noise estimation accuracy, and can be expected to improve the transmission speed / transmission efficiency.

Further, the transmitter 100 adjusts the transmission power so as to be within the maximum transmission power of each antenna port, so that when the surplus power of the transmission power of the transmitter 100 is small, the transmitter 100 is transmitted with a power lower than the intended power. Moreover, it is possible to prevent the signal from being distorted.

How to set the transmission power described above (for example, operation examples 1 to 5) may depend on the implementation of the transmitter 100. For example, the transmitter 100 may adjust the transmission power by applying any of the methods of the above operation examples 1 to 5, and the method of any of the above operation examples 1 to 5 depends on the radio condition or the condition. May be selected to adjust the transmission power.

Further, when the remaining power of the transmitter 100 becomes large after the transmission power is reduced as in the above-mentioned operation examples 1 to 5, the transmitter 100 may cancel the setting of the transmission power reduction. Good.

Further, in the present embodiment, _{the calculation method of the ratio ρ PTRS, i} shown in the equation (2) is not limited to the above contents, and other methods may be used.

(Embodiment 2)
In the present embodiment, a case where the transmitter (that is, the mobile station) power boosts the PT-RS and transmits it in the uplink will be described. Further, in the present embodiment, the base station (receiver) instructs the mobile station whether or not the transmission power adjustment described in the first embodiment is necessary.

[Outline of communication system]
The communication system according to the present embodiment includes a mobile station 300 (transmitter) and a base station 400 (receiver). The PT-RS is transmitted from the mobile station 300 to the base station 400.

[Mobile station configuration]
FIG. 14 is a block diagram showing a configuration of a mobile station 300 (transmitter) according to the present embodiment. In FIG. 14, the same components as those in the first embodiment (FIG. 6) are designated by the same reference numerals, and the description thereof will be omitted. Specifically, the mobile station 300 shown in FIG. 14 includes a receiving unit 302, a signal separating unit 303, a data demodulation unit 304, and an error correction decoding unit 305, in addition to the configuration of the transmitter 100 shown in FIG. Prepare anew. Further, the operations of the antenna 301, the control unit 306, and the error correction coding unit 307 are partially different from the operations of the antenna 106, the control unit 101, and the error correction coding unit 102 shown in FIG.

The antenna 301 radiates a signal input from the transmission unit 105 toward the base station 400. Further, the antenna 301 receives the signal transmitted from the base station 400 and outputs the received signal to the receiving unit 302.

The receiving unit 302 performs wireless reception processing such as frequency conversion on the received signal input from the antenna 301, and outputs the signal after the wireless reception processing to the signal separation unit 303.

The signal separation unit 303 separates the DCI and the data signal from the signals input from the reception unit 302, outputs the DCI to the control unit 306, and outputs the data signal to the data demodulation unit 304.

The data demodulation unit 304 demodulates the data signal input from the signal separation unit 303, and outputs the demodulated signal to the error correction decoding unit 305.

The error correction decoding unit 305 decodes the demodulated signal input from the data demodulation unit 304, extracts the RRC signal from the obtained received data signal, and outputs the RRC signal to the control unit 306.

The control unit 306 calculates the power headroom (PH: Power Headroom) indicating the transmission power remaining capacity of the mobile station 300, generates a PHR (Power Headroom Report) to report to the base station 400, and causes the error correction coding unit 307 to generate a PHR (Power Headroom Report). Output. Further, the control unit 306 sets the data signal, the PT-RS, and the like based on the information included in the DCI input from the signal separation unit 303 and the information contained in the RRC signal input from the error correction decoding unit 305. Determines the transmission power of the transmission signal. The DCI or RRC signal may include, for example, information indicating the necessity of adjusting the transmission power (or information instructing the adjustment of the transmission power). The control unit 306 outputs the determined transmission power information to the signal allocation unit 104.

The error correction coding unit 307 performs error correction coding of the input transmission data signal or the PHR input from the control unit 306, and outputs the signal after the error correction coding to the modulation unit 103.

[Base station configuration]
FIG. 15 is a block diagram showing a configuration of a base station 400 (receiver) according to the present embodiment. In FIG. 15, the same components as those in the first embodiment (FIG. 7) are designated by the same reference numerals, and the description thereof will be omitted. Specifically, in addition to the configuration of the receiver 200 shown in FIG. 7, the base station 400 shown in FIG. 15 includes a control unit 402, an error correction coding unit 403, a modulation unit 404, and a signal allocation unit 405. It is newly equipped with a transmitter 406. Further, the operations of the antenna 407, the channel estimation unit 408, and the error correction / decoding unit 401 are partially different from the operations of the antenna 201, the channel estimation unit 204, and the error correction / decoding unit 207 shown in FIG. 7.

The error correction decoding unit 401 decodes the demodulated signal input from the data demodulation unit 206 and outputs the obtained received data signal. Further, the error correction / decoding unit 401 extracts the PHR from the data signal and outputs the PHR to the control unit 402.

The control unit 402 determines whether or not the mobile station 300 should apply the transmission power control (transmission power adjustment) described in the first embodiment based on the PHR input from the error correction decoding unit 401. Further, the control unit 402 determines, for example, a signal waveform (waveform), a modulation method (MCS), and an allocated band to be applied to data transmission in the mobile station 300. The control unit 402 generates a DCI (that is, dynamic signaling) and an RRC signal (that is, upper layer signaling) based on the determination result and the determined content, outputs the DCI to the signal allocation unit 405, and makes an error in the RRC signal. Output to the correction code unit 403.

Further, the control unit 402 indicates whether or not the transmission power control described in the first embodiment is applied to the signal received from the mobile station 300 based on the determination result regarding the necessity of the transmission power adjustment. "Amplitude information of PT-RS and the like" is output to the channel estimation unit 408. The amplitude information of the PT-RS or the like may include, for example, information on the amplitude (power) ratio between the PT-RS and the data signal after the transmission power adjustment.

The error correction coding unit 403 performs error correction coding of the RRC signal input from the control unit 402, and outputs the signal after the error correction coding to the modulation unit 404.

The modulation unit 404 performs modulation processing on the signal input from the error correction coding unit 403, and outputs the modulated signal to the signal allocation unit 405.

The signal allocation unit 405 maps the signal input from the modulation unit 404 and the DCI input from the control unit 402 to the time / frequency domain, and outputs the mapped signal to the transmission unit 406.

The transmission unit 406 performs wireless transmission processing such as frequency conversion using a carrier wave on the signal input from the signal allocation unit 405, and outputs the signal after the wireless transmission processing to the antenna 407.

The antenna 407 receives the signal transmitted from the mobile station 300 (see FIG. 14) and outputs the received signal to the receiving unit 202. Further, the antenna 407 radiates (transmits) a signal input from the transmission unit 406 toward the mobile station 300.

The channel estimation unit 408 estimates the channel using the DMRS input from the signal separation unit 203. At this time, the channel estimation unit 408 may estimate the channel using PT-RS. When the PT-RS is used, the channel estimation unit 408 may determine the amplitude (power) ratio between the PT-RS and the data signal based on the amplitude information of the PT-RS or the like input from the control unit 402. Good. The channel estimation unit 408 outputs the channel estimation value (channel information) to the data demodulation unit 206. When PT-RS is not used in the channel estimation by the channel estimation unit 408, the amplitude information of the PT-RS or the like does not have to be input to the channel estimation unit 408.

[Operation of mobile station 300 and base station 400]
Next, the operations of the mobile station 300 and the base station 400 will be described in detail.

The mobile station 300 performs non-coherent transmission or partial coherent transmission on the uplink using a high frequency band and a high-order modulation multi-value number.

In the mobile station 300, the base station 400 determines whether or not "the remaining power for transmitting with the set transmission power at the PT-RS port is insufficient", that is, whether or not the transmission power adjustment is necessary. To judge.

Then, when the base station 400 has insufficient spare power to transmit a signal with the set transmission power at the PT-RS port, the mobile station applies the transmission power adjustment described in the first embodiment. Instruct 300. That is, when the mobile station 300 is instructed to adjust the transmission power from the base station 400, the mobile station 300 adjusts the transmission power so as to be equal to or less than the maximum transmission power for each antenna port as described in the first embodiment.

Specific operation examples 1 and 2 of the mobile station 300 and the base station 400 will be described below.

<Operation example 1>
In operation example 1, the mobile station 300 first calculates the transmission power of the data signal using the parameters notified from the base station 400 and the like. Further, the mobile station 300 determines the transmission power for each RE in the PT-RS port by using the _{ratio ρ PTRS, i} shown in the equation (2). That is, the mobile station 300 power boosts the PT-RS.

Next, the mobile station 300 calculates PH. PH is, for example, a value obtained by subtracting the transmission power of the data signal at all the antenna ports calculated above from the maximum transmission power of the entire mobile station 300. Then, the mobile station 300 reports the calculated PH as a PHR to the base station 400.

When the received PHR value is less than the threshold value, the base station 400 determines that the mobile station 300 does not have sufficient surplus power at the PT-RS port, and the mobile station 300 is as described in the first embodiment. Is instructed to adjust (reduce) the transmission power. This instruction may be explicitly or implicitly communicated by an RRC signal or DCI.

When the mobile station 300 is instructed to adjust the transmission power, as described in the first embodiment, the mobile station 300 reduces the transmission power of the PT-RS or the data signal, and adjusts the PT-RS, the data signal, and the like. It is transmitted to the base station 400.

As described above, in the operation example 1, when the PHR calculated by using the maximum transmission power of the entire mobile station 300 and the transmission power of the data signal is less than the threshold value, the transmission power is transmitted from the base station 400 to the mobile station 300. Adjustment is instructed. As a result, since the same PHR as LTE can be used in the transmission power control, it is possible to reduce the number of configurations to be additionally implemented in the mobile station 300 and the base station 400 for the transmission power control.

Although the case where the PHR represents the remaining power in all the antenna ports of the mobile station 300 has been described here, the present invention is not limited to this. For example, PHR may be a value obtained by subtracting the transmission power of the data signal at the PT-RS port from the maximum transmission power at the PT-RS port. That is, when the PHR calculated by using the maximum transmission power at the PT-RS port of the mobile station 300 and the transmission power of the data signal is less than the threshold value, the transmission power is adjusted from the base station 400 to the mobile station 300 transmitter. Is instructed. As a result, the base station 400 can grasp the transmission power status of the PT-RS port in more detail, so that it can more accurately determine whether or not it is necessary to reduce the transmission power, and appropriately for the mobile station 300. I can instruct.

<Operation example 2>
In the operation example 2, the mobile station 300 first calculates the data transmission power using the parameters and the like notified from the base station 400, as in the operation example 1. Further, the mobile station 300 determines the transmission power for each RE in the PT-RS port by using the _{ratio ρ PTRS, i} shown in the equation (2). That is, the mobile station 300 power boosts the PT-RS.

On the other hand, the base station 400 provides the mobile station 300 with at least one of the waveform (for example, CP-OFDM or DFT-S-OFDM), MCS, and band (for example, the number of PRBs) used for transmitting the data signal. Instruct.

The mobile station 300 determines whether or not to perform the transmission power adjustment as described in the first embodiment based on at least one of the waveform, MCS, and band instructed by the base station 400.

For example, when the notified waveform is "DFT-S-OFDM", the mobile station 300 reduces the transmission power of the PT-RS or the data signal as described in the first embodiment, and adjusts the PT. -Transmit RS, data signals, etc. to base station 400. This is because when the notified waveform is DFT-S-OFDM (that is, a single carrier waveform), the mobile station 300 is likely to be present at the cell edge, so that the transmission power is likely to be extremely high. ..

Further, when the notified MCS is "MCS lower than the threshold value", the mobile station 300 reduces the transmission power of the PT-RS and the data signal as described in the first embodiment, and adjusts the transmission power. The PT-RS, data signals, etc. are transmitted to the base station 400. This is because if the notified MCS is a lower MCS than the MCS within the range of the advanced MCS such that the PT-RS is transmitted, the mobile station 300 is in a noisy environment with respect to the base station 400. This is because there is a high possibility that the transmission is forced to be performed and the transmission power is likely to be large.

Further, when the notified band is "wider than the threshold value", the mobile station 300 reduces the transmission power of the PT-RS and the data signal as described in the first embodiment, and adjusts the PT-RS and the data signal. A data signal or the like is transmitted to the base station 400. This is because the data transmission power increases depending on the allocated bandwidth, and therefore, if the notified band is wider than a certain value, the transmission power is likely to be large.

In this way, the mobile station 300 may determine whether or not to adjust the transmission power based on any one or more parameters of the waveform, MCS, and band used for data transmission.

That is, the base station 400 implicitly instructs the mobile station 300 whether or not to apply the transmission power control as described in the first embodiment by notifying at least one of the waveform, the MCS, and the band. In such an implicit notification, it is not necessary to use the PHR described in the operation example 1 in the transmission power control. Therefore, in the mobile station 300 and the base station 400, it is possible to reduce the number of configurations additionally implemented for transmission power control.

The operation examples 1 and 2 have been described above.

As described above, in the present embodiment, the mobile station 300 transmits the data signal with the specified transmission power in the case of non-coherent transmission or partial coherent transmission, and power boosts and transmits the PT-RS. At this time, when the base station 400 determines that the PT-RS port of the mobile station 300 does not have enough spare power to transmit with the set transmission power, the base station 400 is set to fall within the maximum transmission power for each antenna port. Instructs the mobile station 300 to adjust the transmission power. The mobile station 300 controls the transmission power according to the instruction of the base station 400.

As a result, as in the first embodiment, even in a transmission in which the power cannot be adjusted between the antenna ports, such as non-coherent transmission or partial coherent transmission, the mobile station 300 responds to the remaining power of the transmission power of the mobile station 300. Therefore, the PT-RS can be transmitted with the strongest possible power within the range that does not exceed the maximum transmission power of each antenna port. As a result, the base station 400 can be expected to improve the transmission speed / transmission efficiency by improving the noise estimation accuracy.

Further, the mobile station 300 adjusts the transmission power so as to be within the maximum transmission power of each antenna port, so that when the surplus power of the transmission power of the mobile station 300 is small, the mobile station 300 is transmitted with a power lower than the intended power. Moreover, it is possible to prevent the signal from being distorted.

Further, in the present embodiment, since the base station 400 instructs the mobile station 300 to adjust the transmission power, the mobile station 300 and the base station 400 communicate with each other in a state where the recognition of the transmission power is aligned. Can be done.

(Embodiment 3)
In the present embodiment, a case where the transmitter (that is, the mobile station) power boosts the PT-RS and transmits it in the uplink will be described. Further, in the present embodiment, the mobile station determines whether or not the transmission power adjustment described in the first embodiment is necessary.

[Outline of communication system]
The communication system according to the present embodiment includes a mobile station 500 (transmitter) and a base station 600 (receiver). The PT-RS is transmitted from the mobile station 500 to the base station 600.

[Mobile station configuration]
FIG. 16 is a block diagram showing a configuration of a mobile station 500 (transmitter) according to the present embodiment. In FIG. 16, the same components as those in the first embodiment (FIG. 6) are designated by the same reference numerals, and the description thereof will be omitted. Specifically, the operations of the control unit 501 and the error correction coding unit 502 are partially different from the operations of the control unit 101 and the error correction coding unit 102 shown in FIG.

The control unit 501 calculates the PH indicating the transmission power remaining capacity of the mobile station 500, generates a PHR to be reported to the base station 600, and outputs the PHR to the error correction coding unit 502. Further, the control unit 501 determines whether or not the transmission power control (transmission power adjustment) described in the first embodiment should be applied based on the calculated PH value. Then, the control unit 501 determines the transmission power of the data signal and the transmission signal such as PT-RS according to the determination result. The control unit 501 outputs the determined transmission power information to the signal allocation unit 104.

The error correction coding unit 502 performs error correction coding on the input transmission data signal or the PHR input from the control unit 501, and outputs the signal after the error correction coding to the modulation unit 103.

[Base station configuration]
FIG. 17 is a block diagram showing a configuration of a base station 600 (receiver) according to the present embodiment. In FIG. 17, the same components as those in the first embodiment (FIG. 7) are designated by the same reference numerals, and the description thereof will be omitted. Specifically, the base station 600 shown in FIG. 17 newly includes a control unit 602 in addition to the configuration of the receiver 200 shown in FIG. 7. Further, the operations of the channel estimation unit 603 and the error correction / decoding unit 601 are different from the operations of the channel estimation unit 204 and the error correction / decoding unit 207 shown in FIG. 7.

The error correction decoding unit 601 decodes the demodulated signal input from the data demodulation unit 206, and outputs the obtained received data signal. Further, the error correction / decoding unit 601 extracts the PHR from the data signal and outputs the PHR to the control unit 602.

The control unit 602 determines whether or not the mobile station 500 applies the transmission power control described in the first embodiment based on the PHR input from the error correction / decoding unit 601. Based on the determination result, the control unit 602 indicates "amplitude information such as PT-RS" indicating whether or not the transmission power control described in the first embodiment is applied to the signal received from the mobile station 500. Is output to the channel estimation unit 603.

The channel estimation unit 603 estimates the channel using the DMRS input from the signal separation unit 203. At this time, the channel estimation unit 603 may estimate the channel using PT-RS. When the PT-RS is used, the channel estimation unit 603 determines the amplitude (power) ratio between the PT-RS and the data signal based on the amplitude information of the PT-RS or the like input from the control unit 602. Good. The channel estimation unit 603 outputs the channel estimation value (channel information) to the data demodulation unit 206.

When the PT-RS is not used in the channel estimation by the channel estimation unit 603, the configuration of the base station 600 may not be necessary, and the base station has the same configuration as the receiver 200 shown in FIG. You just have to prepare.

[Operation of mobile station 500 and base station 600]
Next, the operations of the mobile station 500 and the base station 600 will be described in detail.

The mobile station 500 performs non-coherent transmission or partial coherent transmission on the uplink using a high frequency band and a high-order modulation multi-value number.

Further, the mobile station 500 determines whether or not "the remaining power for transmitting with the set transmission power at the PT-RS port is insufficient", that is, whether or not the transmission power adjustment is necessary. To do.

Then, when the mobile station 500 has insufficient spare power to transmit a signal with the set transmission power at the PT-RS port, the mobile station 500 adjusts the transmission power described in the first embodiment.

On the other hand, the base station 600 determines, in the same manner as the mobile station 500, whether or not the mobile station 500 "insufficient reserve power for transmitting with the set transmission power at the PT-RS port". .. Then, when the base station 600 has insufficient spare power to transmit a signal with the set transmission power at the PT-RS port, the mobile station 500 performs the transmission power control described in the first embodiment. Apply and determine that the signal is transmitted. In this case, the base station 600 performs channel estimation in consideration of, for example, that the transmission power of the PT-RS or the data signal is reduced.

Hereinafter, specific operation examples of the mobile station 500 and the base station 600 will be described.

In the operation example, the mobile station 500 first calculates the transmission power of the data signal using the parameters notified from the base station 600 and the like. Further, the mobile station 500 determines the transmission power for each RE in the PT-RS port by using the _{ratio ρ PTRS, i} shown in the equation (2). That is, the mobile station 500 power boosts the PT-RS.

Next, the mobile station 500 calculates PH. PH is, for example, a value obtained by subtracting the transmission power of the data signal at all the antenna ports calculated above from the maximum transmission power of the entire mobile station 500. Then, the mobile station 500 reports the calculated PH as a PHR to the base station 600.

Further, when the calculated PH value is less than the threshold value, the mobile station 500 determines that the PT-RS port of the mobile station 500 does not have sufficient surplus power, and as described in the first embodiment, the PT-RS Alternatively, the transmission power of the data signal is reduced, and the adjusted PT-RS, the data signal, and the like are transmitted to the base station 600.

Similarly, when the value of PHR reported from the mobile station 500 is less than the threshold value, the base station 600 applies the transmission power adjustment as described in the first embodiment to the received data signal or the PT-RS. The channel is estimated in consideration of the decrease in transmission power.

As described above, in the operation example, when the PHR calculated by using the maximum transmission power of the entire mobile station 500 and the transmission power of the data signal is less than the threshold value, the mobile station 500 adjusts the transmission power, and the base station 600 adjusts the transmission power. It is determined that the transmission power adjustment is performed in the mobile station 500. As a result, since the same PHR as LTE can be used in the transmission power control, it is possible to reduce the number of configurations to be additionally implemented in the mobile station 500 and the base station 600 for the transmission power control.

Although the case where the PHR represents the remaining power in all the antenna ports of the mobile station 500 has been described here, the present invention is not limited to this. For example, PHR may be a value obtained by subtracting the transmission power of the data signal at the PT-RS port from the maximum transmission power at the PT-RS port. That is, when the PHR calculated by using the maximum transmission power at the PT-RS port of the mobile station 500 and the transmission power of the data signal is less than the threshold value, the mobile station 500 adjusts the transmission power. As a result, the mobile station 500 and the base station 600 can grasp the transmission power status of the PT-RS port in more detail, so that it is possible to more accurately determine whether or not it is necessary to reduce the transmission power.

The operation example has been described above.

As described above, in the present embodiment, the mobile station 500 transmits the data signal with the specified transmission power in the case of non-coherent transmission or partial coherent transmission, and power boosts and transmits the PT-RS. At this time, when the mobile station 500 determines that the PT-RS port of the mobile station 500 does not have enough spare power to transmit with the set transmission power, the mobile station 500 is set to fall within the maximum transmission power for each antenna port. Adjust the transmission power to.

As a result, as in the first embodiment, even in a transmission in which the power cannot be adjusted between the antenna ports, such as non-coherent transmission or partial coherent transmission, the mobile station 500 responds to the remaining power of the transmission power of the mobile station 500. Therefore, the PT-RS can be transmitted with the strongest possible power within the range that does not exceed the maximum transmission power of each antenna port. As a result, the base station 600 can be expected to improve the transmission speed / transmission efficiency by improving the noise estimation accuracy.

Further, the mobile station 500 adjusts the transmission power so as to be within the maximum transmission power of each antenna port, so that when the remaining power of the transmission power of the mobile station 500 is small, the mobile station 500 is transmitted with a power lower than the intended power. Moreover, it is possible to prevent the signal from being distorted.

Further, in the present embodiment, since the mobile station 500 determines whether or not to adjust the transmission power, it is possible to set an appropriate transmission power without waiting for the instruction of the base station 600.

The embodiments of the present disclosure have been described above.

(Other embodiments)
(1) The "CPE / ICI correction" used in the above embodiment means "correcting the CPE", "correcting the ICI", or "correcting both the CPE and the ICI". To do.

(2) In the above embodiment, the transmission of the uplink is mainly assumed, but the transmission power control described above may also be applied to the transmission of the downlink.

(3) In the above embodiment, non-coherent transmission and partial coherent transmission are assumed, but the contents of the present disclosure can be applied to methods other than these transmissions.

(4) In the above embodiment, a case where data is transmitted using two antenna ports (1000, 1001) has been described as an example. However, the number of antenna ports for transmitting data is not limited to two, and a number of antenna ports other than two may be used. However, if there is only one antenna port that can transmit data, it is not possible to say "use the power of resources not used by other antenna ports", so PT-RS power boosting may not be applied. is assumed.

Further, although the case where PT-RS is mapped to one antenna port has been described, the number of antenna ports to which PT-RS is mapped is not limited to one. The number of antenna ports to which the PT-RS is mapped may be two or more.

(5) The PHR used in the second and third embodiments may be transmitted periodically in time, or may be transmitted each time the transmission power reserve capacity changes. In addition, the application and cancellation of the reduction in transmission power described in the first embodiment may be switched each time the remaining transmission power capacity changes.

(6) When the control channel (PDCCH (Physical Downlink Control CHannel), PUCCH (Physical Uplink Control CHannel)) and the data channel (PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel)) are frequency-multiplexed. May be mapped to the symbol by PT-RS.

(7) In the above embodiment (FIG. 1), the slot length is assumed to be 14 symbols, but the slot length is not limited to 14 symbols, for example, the slot length is 7 symbols or other. It may be the number of symbols.

(8) The present disclosure can be realized by software, hardware, or software linked with hardware. Each functional block used in the description of the above embodiment is partially or wholly realized as an LSI which is an integrated circuit, and each process described in the above embodiment is partially or wholly. It may be controlled by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip so as to include a part or all of functional blocks. The LSI may include data input and output. LSIs may be referred to as ICs, system LSIs, super LSIs, and ultra LSIs depending on the degree of integration. The method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Further, an FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and setting of the circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing. Furthermore, if an integrated circuit technology that replaces an LSI appears due to advances in semiconductor technology or another technology derived from it, it is naturally possible to integrate functional blocks using that technology. There is a possibility of applying biotechnology.

(9) The present disclosure can be implemented in all kinds of devices, devices, and systems (collectively referred to as communication devices) having a communication function. Non-limiting examples of communication devices include telephones (mobile phones, smartphones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital stills / video cameras, etc.). ), Digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smart watches, tracking devices, etc.), game consoles, digital book readers, telehealth telemedicines (remote health) Care / medicine prescription) devices, vehicles with communication functions or mobile transportation (automobiles, airplanes, ships, etc.), and combinations of the above-mentioned various devices can be mentioned.

Communication devices are not limited to those that are portable or mobile, but are not portable or fixed, any type of device, device, system, such as a smart home device (home appliances, lighting equipment, smart meters or It also includes measuring instruments, control panels, etc.), vending machines, and any other "Things" that can exist on the IoT (Internet of Things) network.

(10) Communication includes data communication by a combination of these, in addition to data communication by a cellular system, a wireless LAN system, a communication satellite system, or the like.

(11) The communication device also includes a device such as a controller or a sensor that is connected or connected to a communication device that executes the communication function described in the present disclosure. For example, it includes controllers and sensors that generate control and data signals used by communication devices that perform the communication functions of the communication device.

(12) Further, the communication device includes infrastructure equipment that communicates with or controls the above-mentioned various devices, such as a base station, an access point, and any other device, device, or system. Is included.

The transmitter of the present disclosure uses a control circuit that determines the transmission power of a phase tracking reference signal (PT-RS) and a data signal within a range that does not exceed the maximum transmission power of each antenna port, and the determined transmission power. , The PT-RS and a transmission circuit for transmitting the data signal.

In the transmitter of the present disclosure, the control circuit uses the transmission power when the transmission power set in the first antenna port to which the PT-RS is transmitted exceeds the maximum transmission power of the first antenna port. Is adjusted to be equal to or less than the maximum transmission power for each antenna port.

In the transmitter of the present disclosure, the control circuit transmits the transmission power of the PT-RS and the data signal transmitted by all the antenna ports while maintaining the power ratio between the PT-RS and the data signal. Reduce.

In the transmitter of the present disclosure, the control circuit reduces the transmission power at the first antenna port and does not reduce the transmission power at antenna ports other than the first antenna port.

In the transmitter of the present disclosure, the control circuit transmits the PT-RS and the data signal transmitted by the first antenna port while maintaining the power ratio between the PT-RS and the data signal. Reduce power.

In the transmitter of the present disclosure, the control circuit reduces the transmission power of the data signal at the first antenna port and does not reduce the transmission power of the PT-RS.

In the transmitter of the present disclosure, the control circuit reduces the transmission power of some resource elements to which the data signal is mapped at the first antenna port, and resources other than the part of the resource elements. It does not reduce the transmission power of the data signal and the PT-RS mapped to the element.

In the transmitter of the present disclosure, the control circuit reduces the transmission power of the PT-RS at the first antenna port and does not reduce the transmission power of the data signal.

In the transmitter of the present disclosure, the transmitter is a mobile station, and the control circuit adjusts the transmission power so as to be equal to or less than the maximum transmission power for each antenna port when instructed by the base station. ..

In the transmitter of the present disclosure, when the PHR (Power Headroom Report) calculated by using the maximum transmission power of the entire transmitter and the transmission power of the data signal is less than the threshold value, the base station sends the transmitter to the transmitter. , The adjustment of the transmission power is instructed.

In the transmitter of the present disclosure, when the PHR (Power Headroom Report) calculated by using the maximum transmission power at the antenna port to which the PT-RS of the transmitter is transmitted and the transmission power of the data signal is less than the threshold value, The base station instructs the transmitter to adjust the transmission power.

In the transmitter of the present disclosure, the control circuit determines whether or not to adjust the transmission power based on at least one of the signal waveform, the coding modulation method, and the allocated band instructed by the base station. To do.

In the transmitter of the present disclosure, the transmitter is a mobile station, and the control circuit adjusts the transmission power so as to be equal to or less than the maximum transmission power for each antenna port.

In the transmitter of the present disclosure, the control circuit adjusts the transmission power when the PHR (Power Headroom Report) calculated by using the maximum transmission power of the entire transmitter and the transmission power of the data signal is less than the threshold value. To do.

In the transmitter of the present disclosure, the control circuit has a PHR (Power Headroom Report) calculated by using the maximum transmission power at the antenna port to which the PT-RS of the transmitter is transmitted and the transmission power of the data signal. If it is less than the threshold value, the transmission power is adjusted.

In the transmission method of the present disclosure, the transmission power of the phase tracking reference signal (PT-RS) and the data signal is determined within a range not exceeding the maximum transmission power of each antenna port, and the determined transmission power is used to determine the transmission power of the PT. -Transmit RS and the data signal.

All disclosures of the specification, drawings and abstract contained in the Japanese application of Japanese Patent Application No. 2018-025861 filed on February 16, 2018 are incorporated herein by reference.

One aspect of the present disclosure is useful for mobile communication systems.

100,300,500 Transmitter 101,306,402,501,602 Control unit 102,307,403,502 Error correction coding unit 103,404 Modulation unit 104,405 Signal allocation unit 105,406 Transmitter unit 106,201, 301,407 Antenna 200,400,600 Receiver 202,302 Receiver 203,303 Signal separator 204,408,603 Channel estimation part 205 CPE / ICI estimation part 206,304 Data demodulation part 207, 305, 401, 601 Error Correction decoding section

Claims (16)

A control circuit that determines the transmission power of the phase tracking reference signal (PT-RS) and data signal within the range that does not exceed the maximum transmission power of each antenna port.
With the transmission circuit that transmits the PT-RS and the data signal with the determined transmission power,
A transmitter equipped with. When the transmission power set in the first antenna port to which the PT-RS is transmitted exceeds the maximum transmission power of the first antenna port, the control circuit sets the transmission power to be equal to or less than the maximum transmission power. To adjust to
The transmitter according to claim 1. The control circuit reduces the transmission power of the PT-RS and the data signal transmitted at all antenna ports while maintaining the power ratio between the PT-RS and the data signal.
The transmitter according to claim 2. The control circuit reduces the transmission power at the first antenna port and does not reduce the transmission power at antenna ports other than the first antenna port.
The transmitter according to claim 2. The control circuit reduces the transmission power of the PT-RS and the data signal transmitted by the first antenna port while maintaining the power ratio between the PT-RS and the data signal.
The transmitter according to claim 4. The control circuit reduces the transmission power of the data signal at the first antenna port and does not reduce the transmission power of the PT-RS.
The transmitter according to claim 4. The control circuit reduces the transmission power of some resource elements to which the data signal is mapped at the first antenna port, and the data mapped to other resource elements other than the part of the resource elements. Does not reduce the transmission power of the signal and the PT-RS,
The transmitter according to claim 4. The control circuit reduces the transmission power of the PT-RS at the first antenna port and does not reduce the transmission power of the data signal.
The transmitter according to claim 4. The transmitter is a mobile station
The control circuit adjusts the transmission power so as to be equal to or less than the maximum transmission power for each antenna port when instructed by the base station.
The transmitter according to claim 1. When the PHR (Power Headroom Report) calculated by using the maximum transmission power of the entire transmitter and the transmission power of the data signal is less than the threshold value, the base station adjusts the transmission power to the transmitter. Instructed,
The transmitter according to claim 9. When the PHR (Power Headroom Report) calculated by using the maximum transmission power at the antenna port to which the PT-RS of the transmitter is transmitted and the transmission power of the data signal is less than the threshold value, the transmitter from the base station. Is instructed to adjust the transmission power.
The transmitter according to claim 9. The control circuit determines whether or not to adjust the transmission power based on at least one of the signal waveform, the coding modulation method, and the allocated band instructed by the base station.
The transmitter according to claim 9. The transmitter is a mobile station
The control circuit adjusts the transmission power so that it is equal to or less than the maximum transmission power for each antenna port.
The transmitter according to claim 1. The control circuit adjusts the transmission power when the PHR (Power Headroom Report) calculated by using the maximum transmission power of the entire transmitter and the transmission power of the data signal is less than the threshold value.
The transmitter according to claim 13. When the PHR (Power Headroom Report) calculated by using the maximum transmission power at the antenna port to which the PT-RS of the transmitter is transmitted and the transmission power of the data signal is less than the threshold value, the control circuit transmits the transmission. Adjust the power,
The transmitter according to claim 13. Determine the transmission power of the phase tracking reference signal (PT-RS) and data signal within the range that does not exceed the maximum transmission power of each antenna port.
The PT-RS and the data signal are transmitted with the determined transmission power.
Sending method.

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